Simplex, SJ258 Mechanical Screw Jacks are reliable tools for a variety of jobs. Their sturdy, simple design makes them ideal for supporting machinery, construction, structural moving and general maintenance. Four way head assembly accommodates lever bar at four different positions for exact leveling, serrated steel cap floats 9 degree on a chrome-moly ball reducing friction and assisting in centering load point. This jack will support the load without creep-down and includes a welded stop to prevent accidental over-extension of the screw.